Method for preparing hydrogen or reducing gas by ammonia cracking through two-stage process

A hydrogen and method ammonia technology is applied in the petrochemical field to achieve the effect of saving heat source, pressure energy consumption and heat source.

Active Publication Date: 2022-01-07
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the safety of the built-in electric furnace must be considered, and the device can only work under low voltage

Method used

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  • Method for preparing hydrogen or reducing gas by ammonia cracking through two-stage process
  • Method for preparing hydrogen or reducing gas by ammonia cracking through two-stage process
  • Method for preparing hydrogen or reducing gas by ammonia cracking through two-stage process

Examples

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Effect test

Embodiment 1

[0049] The flow process of the two-stage ammonia cracking hydrogen production of the present embodiment is as follows:

[0050] Process such as figure 1 shown. In this example, the raw material liquid ammonia has a flow rate of ~50800kg / h, a temperature of normal temperature, and a pressure of ~1.5MPa(G). It is first partially gasified by the raw material preheater (E1) and then heated by the raw material gasifier (E2). The high-temperature flue gas of the furnace completely vaporizes the raw material liquid ammonia. Except a small part of gaseous ammonia is used as supplementary fuel gas (flow rate ~ 800kg / h), the rest is sent to the first heat exchange ammonia cracking reactor (R1) for partial ammonia cracking reaction. The first-stage heat exchange ammonia cracking reaction system (R1) is set as a reactor with heat exchange, the reactor is equipped with a catalyst, and the required heat source is provided by heat exchange of the second-stage high-temperature ammonia crack...

Embodiment 2

[0054] The flow process of the two-stage ammonia cracking hydrogen production of the present embodiment is as follows:

[0055] Process such as figure 2 shown. In this embodiment, the raw material liquid ammonia has a flow rate of ~50000kg / h, a temperature of normal temperature, and a pressure of ~3.0MPa(G). It is first partially vaporized by the raw material preheater (E1) and then heated by the raw material gasifier (E4). The high-temperature flue gas of the furnace completely vaporizes the raw material liquid ammonia. The gaseous ammonia enters the first-stage heat exchange ammonia cracking reaction system, and the first-stage heat exchange ammonia cracking reaction system is set as a separate secondary raw material heater (E2) and a separate first-stage adiabatic reactor (R1). Gaseous ammonia enters the secondary raw material heater (E2), is heated to 550-650°C by the reaction gas at the outlet of the second-stage high-temperature reactor, and then sent to the adiabatic...

Embodiment 3

[0059] The flow process of reducing gas produced by the two-stage ammonia cracking of the present embodiment is as follows:

[0060] Process such as image 3 shown. In this example, the raw material liquid ammonia has a flow rate of ~6400kg / h, a temperature of normal temperature, and a pressure of ~0.8MPa(G). It is first partially vaporized by the raw material preheater (E1) and then heated by the raw material gasifier (E3). The high-temperature flue gas of the furnace completely vaporizes the raw material liquid ammonia. The gaseous ammonia enters the first-stage heat exchange ammonia cracking reaction system, and the first-stage heat exchange ammonia cracking reaction system is set as a separate secondary raw material heater (E2) and a separate one-stage adiabatic reactor (R1), and the reactor is equipped with catalyst. Gaseous ammonia enters the secondary raw material heater (E2) and is heated by the reaction gas at the outlet of the second-stage high-temperature reactor...

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Abstract

The invention particularly relates to a method for preparing hydrogen or reducing gas by ammonia cracking through a two-stage process, which comprises the following steps that firstly, raw material liquid ammonia iscompletely gasified and heated through a heat exchange gasification system, then enters a first-stage heat exchange ammonia cracking reaction system, and a partial ammonia cracking reaction is conducted, the reaction gas discharged from the first-stage heat exchange ammonia cracking reaction system enters the second-stage high-temperature ammonia cracking reaction system to carry out a residual ammonia cracking reaction, and the second-stage high-temperature ammonia cracking reaction gas sequentially enters the first-stage heat exchange ammonia cracking reaction system and the heat exchange gasification system to obtain the reducing gas after heat is recovered step by step. And when the reducing gas needs to be subsequently prepared into hydrogen, the reaction gas is cooled to normal temperature after heat recovery, and then enters a PSA hydrogen extraction system to prepare the product hydrogen. The two-stage ammonia cracking method is adopted, the gas heat of a second-stage high-temperature ammonia cracking reaction outlet is fully utilized, the external heat supply amount is saved, and meanwhile, the investment of a second-stage high-temperature ammonia cracking reaction system is reduced.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and relates to a technology for producing hydrogen or reducing gas from liquid ammonia, in particular to a method for producing hydrogen or reducing gas by two-stage ammonia cracking. Background technique [0002] Hydrogen production by ammonia decomposition mainly refers to heating ammonia to 800-850°C, under the action of catalyst, ammonia (gaseous state) is decomposed to obtain hydrogen containing 75% hydrogen 2 , 25%N 2 mixed gas of hydrogen and nitrogen. Subsequently, the mixed gas is subjected to hydrogen purification treatment, and finally high-purity hydrogen can be obtained. [0003] Existing ammonia decomposition devices have relatively large limitations. Most of them use liquid ammonia as the raw material, and under low pressure, they are vaporized and gasified into the decomposition furnace through the gasifier. The built-in electric furnace of the decomposition furnace is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/04
CPCC01B3/047C01B2203/0277C01B2203/0805Y02E60/36
Inventor 蹇守华葛得翠刘卓衢李林王键张新波武立新姬存民汪恒杨宽辉蒲裕李克兵钟翔赵为仓杨建军
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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